Seatable[0] is another alternative which is mostly open source, following a licensing similar to MongoDB for their server if I recall correctly. They're now on

Seatable[0] is another alternative which is mostly open source, following a licensing similar to MongoDB for their server if I recall correctly. They're now on version 1.3, not sure if they're fully stable yet but it's a viable self-hosted alternative. [0] https://seatable.io/ https://seatable.io/